UpLoadFileCheck = function() {
		this.AllowExt = ".jpg,.gif,.png,.bmp";//允许上传的文件类型 0为无限制 每个扩展名后边要加一个"," 小写字母表示 
		this.AllowImgFileSize = 0;//允许上传文件的大小 0为无限制 单位：KB 
		this.AllowImgWidth = 0;//允许上传的图片的宽度 0为无限制　单位：px(像素) 
		this.AllowImgHeight = 0;//允许上传的图片的高度 0为无限制　单位：px(像素) 
		this.ImgObj = new Image();
		this.ImgFileSize = 0;
		this.ImgWidth = 0;
		this.ImgHeight = 0;
		this.FileExt = "";
		this.ErrMsg = "";
		this.IsImg = false;//全局变量

	}

	UpLoadFileCheck.prototype.CheckExt = function(obj) {
		this.ErrMsg = "";
		this.ImgObj.src = obj.value;
		//this.HasChecked=false;  
		if (obj.value == "") {
			this.ErrMsg = "请选择一个文件";
		} else {
			this.FileExt = obj.value.substr(obj.value.lastIndexOf("."))
					.toLowerCase();
			if (this.AllowExt != 0 && this.AllowExt.indexOf(this.FileExt) == -1)//判断文件类型是否允许上传 
			{
				this.ErrMsg = "该文件类型不允许上传。请上传 " + this.AllowExt
						+ " 类型的文件，当前文件类型为" + this.FileExt;
			}
		}
		if (this.ErrMsg != "") {
			this.ShowMsg(this.ErrMsg, false);
			return false;
		} else
			return this.CheckProperty(obj);
	}

	UpLoadFileCheck.prototype.CheckProperty = function(obj) {
		while (this.ImgObj.readyState != "complete")//
		{
			sleep(1000);//一秒使用图能完全加载    
		}

		if (this.IsImg == true) {
			this.ImgWidth = this.ImgObj.width;//取得图片的宽度 
			this.ImgHeight = this.ImgObj.height;//取得图片的高度
			if (this.AllowImgWidth != 0 && this.AllowImgWidth < this.ImgWidth)
				this.ErrMsg = this.ErrMsg + "图片宽度超过限制。请上传宽度小于"
						+ this.AllowImgWidth + "px的文件，当前图片宽度为" + this.ImgWidth
						+ "px";

			if (this.AllowImgHeight != 0
					&& this.AllowImgHeight < this.ImgHeight)
				this.ErrMsg = this.ErrMsg + "图片高度超过限制。请上传高度小于"
						+ this.AllowImgHeight + "px的文件，当前图片高度为"
						+ this.ImgHeight + "px";
		}

		this.ImgFileSize = Math.round(this.ImgObj.fileSize / 1024 * 100) / 100;//取得图片文件的大小  
		alert(this.ImgFileSize);
		if (this.AllowImgFileSize != 0
				&& this.AllowImgFileSize < this.ImgFileSize)
			this.ErrMsg = this.ErrMsg + "文件大小超过限制。请上传小于"
					+ this.AllowImgFileSize + "KB的文件，当前文件大小为"
					+ this.ImgFileSize + "KB";

		if (this.ErrMsg != "") {
			this.ShowMsg(this.ErrMsg, false);
			return false;
		} else
			return true;
	}

	UpLoadFileCheck.prototype.ShowMsg = function(msg, tf)//显示提示信息 tf=false 显示错误信息 msg-信息内容 
	{
		/*msg=msg.replace("/n","<li>"); 
		msg=msg.replace(//n/gi,"<li>"); 
		 */
		alert(msg);
	}
	function sleep(num) {
		var tempDate = new Date();
		var tempStr = "";
		var theXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		while ((new Date() - tempDate) < num) {
			tempStr += "/n" + (new Date() - tempDate);
			try {
				theXmlHttp
						.open("get", "about:blank?JK=" + Math.random(), false);
				theXmlHttp.send();
			} catch (e) {
				;
			}
		}
		//containerDiv.innerText=tempStr;   
		return;
	}

	function c(obj) {
		var d = new UpLoadFileCheck();
		d.IsImg = true;
		d.AllowImgFileSize = 20;
		d.CheckExt(obj);
	}